Add sector245/s245_streamdeck keyboard

keyboards/handwired/sector245/s245/keyboard.json

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+{
+    "keyboard_name": "S245 Streamdeck",
+    "manufacturer": "sector245",
+    "maintainer": "sector245",
+    "processor": "RP2040",
+    "bootloader": "rp2040",
+    "debounce": 20,
+    "usb": {
+        "vid": "0x5345",
+        "pid": "0x0001",
+        "device_version": "1.0.0"
+    },
+    "features": {
+        "bootmagic": true,
+        "extrakey": true,
+        "encoder": true
+    },
+    "matrix_pins": {
+        "direct": [
+            ["GP2", "GP3", "GP13"],
+            ["GP4", "GP5", "GP6"],
+            ["GP7", "GP8", "GP9"]
+        ]
+    },
+    "encoder": {
+        "rotary": [
+            {
+                "pin_a": "GP10",
+                "pin_b": "GP11",
+                "resolution": 2
+            }
+        ]
+    },
+    "community_layouts": ["ortho_3x3"],
+    "layouts": {
+        "LAYOUT_ortho_3x3": {
+            "layout": [
+                {"matrix": [0, 0], "x": 0, "y": 0},
+                {"matrix": [0, 1], "x": 1, "y": 0},
+                {"matrix": [0, 2], "x": 2, "y": 0, "encoder": 0},
+                {"matrix": [1, 0], "x": 0, "y": 1},
+                {"matrix": [1, 1], "x": 1, "y": 1},
+                {"matrix": [1, 2], "x": 2, "y": 1},
+                {"matrix": [2, 0], "x": 0, "y": 2},
+                {"matrix": [2, 1], "x": 1, "y": 2},
+                {"matrix": [2, 2], "x": 2, "y": 2}
+            ]
+        }
+    }
+}

keyboards/handwired/sector245/s245/keymaps/default/keymap.c

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+// Copyright 2025 sector245 (@sector245)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    [0] = LAYOUT_ortho_3x3(
+        KC_A,    KC_B,    KC_C,
+        KC_D,    KC_E,    KC_F,
+        KC_G,    KC_H,    KC_I
+    )
+};
+
+#if defined(ENCODER_MAP_ENABLE)
+const uint16_t PROGMEM encoder_map[][NUM_ENCODERS][NUM_DIRECTIONS] = {
+    [0] = { ENCODER_CCW_CW(KC_VOLD, KC_VOLU) } 
+};
+#endif

keyboards/handwired/sector245/s245/readme.md

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+# S245 Streamdeck
+
+A 3x3 macropad with rotary encoder.
+
+* Keyboard Maintainer: [sector245](https://github.com/sinomau)
+* Hardware Supported: S245 Streamdeck PCB, RP2040
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/sector245/s245:default
+
+Flashing example for this keyboard:
+
+    make handwired/sector245/s245:default:flash
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
+
+## Bootloader
+
+Enter the bootloader in 3 ways:
+
+* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (top left key) and plug in the keyboard
+* **Physical reset button**: Hold the BOOTSEL button on the Pico and plug in the keyboard
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available